A yellow smiley face is drawn in SVG, with a circular head, two eyes, and a curved mouth defined using `d3.arc()`. The eyebrows, rendered as rectangles, animate upward and back down via chained `transition().duration()` calls on their group’s `transform` attribute. The code uses D3 v6 selections and `parseFloat`/unary plus to read SVG dimensions, positioning all features relative to the center.